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A method for preparing layered lithium manganate cathode material by doping with low lithium-manganese ratio

A layered lithium manganate, cathode material technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of low utilization rate of raw materials, uneven distribution, irregular morphology, etc. Uniform and good crystallinity

Active Publication Date: 2022-04-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the preparation processes have gradually matured, but there are problems such as uneven distribution, cumbersome process, low utilization rate of raw materials, irregular shape, and low purity.

Method used

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  • A method for preparing layered lithium manganate cathode material by doping with low lithium-manganese ratio
  • A method for preparing layered lithium manganate cathode material by doping with low lithium-manganese ratio
  • A method for preparing layered lithium manganate cathode material by doping with low lithium-manganese ratio

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Embodiment 1

[0036] The present embodiment provides a low lithium-manganese ratio doped lithium battery cathode material layered lithium manganate preparation method, doped elements are Ce, comprising the following steps:

[0037] (a) The LiOH · H 2 O、Mn 2 O 3 and Ce(SO 4 ) 2 ·4H 2 O According to the molar ratio of 1:0.9:0.1, the ball ratio of 6:1, and the speed of 120 rpm / min ball grinding mixture are used to obtain the product containing Ce element;

[0038] (b) The product containing Ce element is mixed with KOH with deionized water to form a mixture of pH = 13.91, and then the mixture is put into a homogeneous reactor, and the catalyst liquid ammonia is added to do a homogeneous catalytic reaction, the homogeneous catalytic reaction temperature is 180 °C, the reaction time is 10h, and the uniform-phase reactor speed is 5 rpm;

[0039] (c) The product after the homogeneous catalytic reaction is washed, dried, and finally the target product is obtained o -LiCe 0.1 Mn 0.9 O 2 。

Embodiment 2

[0041] The present embodiment provides a low lithium-manganese ratio doped lithium battery cathode material layered lithium manganate preparation method, doped elements are Fe, comprising the following steps:

[0042] (a) The LiOH · H 2 O、Mn 2 O 3 and Fe 2 O 3 According to the molar ratio of 1:0.9:0.1, the ball ratio of 6:1, and the speed of 120 rpm / min ball grinding mixture are obtained to obtain the product containing Fe element;

[0043] (b) The product containing Fe element is mixed with NaOH with deionized water to form a mixture of pH = 13.93, and then the mixture is put into a homogeneous reactor, and the catalyst liquid ammonia is added to do a homogeneous catalytic reaction, the homogeneous catalytic reaction temperature is 180 °C, the reaction time is 10h, and the homogeneous reactor speed is 5 rpm;

[0044] (c) The product after the homogeneous catalytic reaction is washed, dried, and finally the target product is obtained o -LiFe 0.1 Mn 0.9 O 2 。

Embodiment 3

[0046] The present embodiment provides a low lithium-manganese ratio doped lithium battery cathode material layered lithium manganate preparation method, doped elements are Sr, comprising the following steps:

[0047] (a) The LiOH · H 2 O、Mn 2 O 3 and SrCO 3 According to the molar ratio of 1:0.9:0.1, the ball ratio of 6:1, the speed of 120 rpm / min ball grinding mixture to obtain products containing Sr element;

[0048] (b) The product containing Sr element is mixed with NaOH with deionized water to form a mixture of pH = 13.97, and then the mixture is put into a homogeneous reactor, and the catalyst liquid ammonia is added to do a homogeneous catalytic reaction, the homogeneous catalytic reaction temperature is 180 °C, the reaction time is 10h, and the homogeneous reactor speed is 5 rpm;

[0049] (c) The product after the homogeneous catalytic reaction is washed, dried, and finally the target product is obtained o -LiSr 0.1 Mn 0.9 O 2 。

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Abstract

The invention relates to a method for preparing a layered lithium manganate positive electrode material by doping with a low lithium-manganese ratio, which belongs to the technical field of lithium-ion batteries; specifically, the lithium source, the manganese source and the doping element source are mixed according to the molar ratio of 1~1.1:0.85 ~0.95:0.05~0.15 for ball mill mixing; put the ball mill mixed product and process control agent into the solution and mix to form a mixed solution, then put the mixed solution into a homogeneous reactor, and add a catalyst at the same time for homogeneous catalysis reaction; the product after the homogeneous catalytic reaction is washed and dried to obtain o ‑LiM x mn 1‑x o 2 ; The present invention reduces the lithium-manganese molar ratio of the raw material, the environment is good, the operation is simple, and it can be used as the positive electrode material o ‑LiMnO 2 The element doping can effectively improve the electrochemical performance of the product, and can be widely used in the technical field of battery materials.

Description

Technical field [0001] The present invention relates to the field of lithium-ion battery technology, specifically a method for preparing a lamellar lithium manganate cathode material doped with a low lithium-manganese ratio. Background [0002] Lithium-ion batteries are the fastest growing high-energy storage devices in the industrial field, and the development of electrode materials is the key to the development of lithium-ion batteries, reducing battery costs and improving battery performance, which is an important indicator of the development of lithium batteries. [0003] Lithium-ion battery cathode material LiMnO 2 Mainly including an oretic structure ( m -LiMnO 2 ) and orthogonal structures ( o -LiMnO 2 ）。 m -LiMnO 2 The crystal structure belongs to the monoclinic crystal system, in which oxygen atoms are stacked in a cubic dense stack, Li + and Mn 3+ Octahedral layer located parallel to the (111) crystal plane of the cubic oxygen unit cell, high spin Mn 3+ Distortion of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 郝晓剑张卫俊潘保武张淑琴张卫琦
Owner ZHONGBEI UNIV
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